diff --git a/osu.Game.Rulesets.Mania/Difficulty/ManiaDifficultyCalculator.cs b/osu.Game.Rulesets.Mania/Difficulty/ManiaDifficultyCalculator.cs index b08c520c54..7dd1755742 100644 --- a/osu.Game.Rulesets.Mania/Difficulty/ManiaDifficultyCalculator.cs +++ b/osu.Game.Rulesets.Mania/Difficulty/ManiaDifficultyCalculator.cs @@ -40,7 +40,7 @@ namespace osu.Game.Rulesets.Mania.Difficulty return new ManiaDifficultyAttributes { - StarRating = difficultyValue(skills) * star_scaling_factor, + StarRating = skills[0].DifficultyValue() * star_scaling_factor, Mods = mods, // Todo: This int cast is temporary to achieve 1:1 results with osu!stable, and should be removed in the future GreatHitWindow = (int)(hitWindows.WindowFor(HitResult.Great)) / clockRate, @@ -49,55 +49,16 @@ namespace osu.Game.Rulesets.Mania.Difficulty }; } - private double difficultyValue(Skill[] skills) - { - // Preprocess the strains to find the maximum overall + individual (aggregate) strain from each section - var overall = skills.OfType().Single(); - var aggregatePeaks = new List(Enumerable.Repeat(0.0, overall.StrainPeaks.Count)); - - foreach (var individual in skills.OfType()) - { - for (int i = 0; i < individual.StrainPeaks.Count; i++) - { - double aggregate = individual.StrainPeaks[i] + overall.StrainPeaks[i]; - - if (aggregate > aggregatePeaks[i]) - aggregatePeaks[i] = aggregate; - } - } - - aggregatePeaks.Sort((a, b) => b.CompareTo(a)); // Sort from highest to lowest strain. - - double difficulty = 0; - double weight = 1; - - // Difficulty is the weighted sum of the highest strains from every section. - foreach (double strain in aggregatePeaks) - { - difficulty += strain * weight; - weight *= 0.9; - } - - return difficulty; - } - protected override IEnumerable CreateDifficultyHitObjects(IBeatmap beatmap, double clockRate) { for (int i = 1; i < beatmap.HitObjects.Count; i++) yield return new ManiaDifficultyHitObject(beatmap.HitObjects[i], beatmap.HitObjects[i - 1], clockRate); } - protected override Skill[] CreateSkills(IBeatmap beatmap) + protected override Skill[] CreateSkills(IBeatmap beatmap) => new Skill[] { - int columnCount = ((ManiaBeatmap)beatmap).TotalColumns; - - var skills = new List { new Overall(columnCount) }; - - for (int i = 0; i < columnCount; i++) - skills.Add(new Individual(i, columnCount)); - - return skills.ToArray(); - } + new Strain(((ManiaBeatmap)beatmap).TotalColumns) + }; protected override Mod[] DifficultyAdjustmentMods { diff --git a/osu.Game.Rulesets.Mania/Difficulty/Skills/Individual.cs b/osu.Game.Rulesets.Mania/Difficulty/Skills/Individual.cs deleted file mode 100644 index 4f7ab87fad..0000000000 --- a/osu.Game.Rulesets.Mania/Difficulty/Skills/Individual.cs +++ /dev/null @@ -1,47 +0,0 @@ -// Copyright (c) ppy Pty Ltd . Licensed under the MIT Licence. -// See the LICENCE file in the repository root for full licence text. - -using System.Linq; -using osu.Game.Rulesets.Difficulty.Preprocessing; -using osu.Game.Rulesets.Difficulty.Skills; -using osu.Game.Rulesets.Mania.Difficulty.Preprocessing; -using osu.Game.Rulesets.Objects; - -namespace osu.Game.Rulesets.Mania.Difficulty.Skills -{ - public class Individual : Skill - { - protected override double SkillMultiplier => 1; - protected override double StrainDecayBase => 0.125; - - private readonly double[] holdEndTimes; - - private readonly int column; - - public Individual(int column, int columnCount) - { - this.column = column; - - holdEndTimes = new double[columnCount]; - } - - protected override double StrainValueOf(DifficultyHitObject current) - { - var maniaCurrent = (ManiaDifficultyHitObject)current; - var endTime = maniaCurrent.BaseObject.GetEndTime(); - - try - { - if (maniaCurrent.BaseObject.Column != column) - return 0; - - // We give a slight bonus if something is held meanwhile - return holdEndTimes.Any(t => t > endTime) ? 2.5 : 2; - } - finally - { - holdEndTimes[maniaCurrent.BaseObject.Column] = endTime; - } - } - } -} diff --git a/osu.Game.Rulesets.Mania/Difficulty/Skills/Overall.cs b/osu.Game.Rulesets.Mania/Difficulty/Skills/Overall.cs deleted file mode 100644 index bbbb93fd8b..0000000000 --- a/osu.Game.Rulesets.Mania/Difficulty/Skills/Overall.cs +++ /dev/null @@ -1,56 +0,0 @@ -// Copyright (c) ppy Pty Ltd . Licensed under the MIT Licence. -// See the LICENCE file in the repository root for full licence text. - -using osu.Game.Rulesets.Difficulty.Preprocessing; -using osu.Game.Rulesets.Difficulty.Skills; -using osu.Game.Rulesets.Mania.Difficulty.Preprocessing; -using osu.Game.Rulesets.Objects; - -namespace osu.Game.Rulesets.Mania.Difficulty.Skills -{ - public class Overall : Skill - { - protected override double SkillMultiplier => 1; - protected override double StrainDecayBase => 0.3; - - private readonly double[] holdEndTimes; - - private readonly int columnCount; - - public Overall(int columnCount) - { - this.columnCount = columnCount; - - holdEndTimes = new double[columnCount]; - } - - protected override double StrainValueOf(DifficultyHitObject current) - { - var maniaCurrent = (ManiaDifficultyHitObject)current; - var endTime = maniaCurrent.BaseObject.GetEndTime(); - - double holdFactor = 1.0; // Factor in case something else is held - double holdAddition = 0; // Addition to the current note in case it's a hold and has to be released awkwardly - - for (int i = 0; i < columnCount; i++) - { - // If there is at least one other overlapping end or note, then we get an addition, buuuuuut... - if (current.BaseObject.StartTime < holdEndTimes[i] && endTime > holdEndTimes[i]) - holdAddition = 1.0; - - // ... this addition only is valid if there is _no_ other note with the same ending. - // Releasing multiple notes at the same time is just as easy as releasing one - if (endTime == holdEndTimes[i]) - holdAddition = 0; - - // We give a slight bonus if something is held meanwhile - if (holdEndTimes[i] > endTime) - holdFactor = 1.25; - } - - holdEndTimes[maniaCurrent.BaseObject.Column] = endTime; - - return (1 + holdAddition) * holdFactor; - } - } -} diff --git a/osu.Game.Rulesets.Mania/Difficulty/Skills/Strain.cs b/osu.Game.Rulesets.Mania/Difficulty/Skills/Strain.cs new file mode 100644 index 0000000000..7ebc1ff752 --- /dev/null +++ b/osu.Game.Rulesets.Mania/Difficulty/Skills/Strain.cs @@ -0,0 +1,80 @@ +// Copyright (c) ppy Pty Ltd . Licensed under the MIT Licence. +// See the LICENCE file in the repository root for full licence text. + +using System; +using osu.Framework.Utils; +using osu.Game.Rulesets.Difficulty.Preprocessing; +using osu.Game.Rulesets.Difficulty.Skills; +using osu.Game.Rulesets.Mania.Difficulty.Preprocessing; +using osu.Game.Rulesets.Objects; + +namespace osu.Game.Rulesets.Mania.Difficulty.Skills +{ + public class Strain : Skill + { + private const double individual_decay_base = 0.125; + private const double overall_decay_base = 0.30; + + protected override double SkillMultiplier => 1; + protected override double StrainDecayBase => 1; + + private readonly double[] holdEndTimes; + private readonly double[] individualStrains; + + private double individualStrain; + private double overallStrain; + + public Strain(int totalColumns) + { + holdEndTimes = new double[totalColumns]; + individualStrains = new double[totalColumns]; + overallStrain = 1; + } + + protected override double StrainValueOf(DifficultyHitObject current) + { + var maniaCurrent = (ManiaDifficultyHitObject)current; + var endTime = maniaCurrent.BaseObject.GetEndTime(); + var column = maniaCurrent.BaseObject.Column; + + double holdFactor = 1.0; // Factor to all additional strains in case something else is held + double holdAddition = 0; // Addition to the current note in case it's a hold and has to be released awkwardly + + // Fill up the holdEndTimes array + for (int i = 0; i < holdEndTimes.Length; ++i) + { + // If there is at least one other overlapping end or note, then we get an addition, buuuuuut... + if (Precision.DefinitelyBigger(holdEndTimes[i], maniaCurrent.BaseObject.StartTime, 1) && Precision.DefinitelyBigger(endTime, holdEndTimes[i], 1)) + holdAddition = 1.0; + + // ... this addition only is valid if there is _no_ other note with the same ending. Releasing multiple notes at the same time is just as easy as releasing 1 + if (Precision.AlmostEquals(endTime, holdEndTimes[i], 1)) + holdAddition = 0; + + // We give a slight bonus to everything if something is held meanwhile + if (Precision.DefinitelyBigger(holdEndTimes[i], endTime, 1)) + holdFactor = 1.25; + + // Decay individual strains + individualStrains[i] = applyDecay(individualStrains[i], current.DeltaTime, individual_decay_base); + } + + holdEndTimes[column] = endTime; + + // Increase individual strain in own column + individualStrains[column] += 2.0 * holdFactor; + individualStrain = individualStrains[column]; + + overallStrain = applyDecay(overallStrain, current.DeltaTime, overall_decay_base) + (1 + holdAddition) * holdFactor; + + return individualStrain + overallStrain - CurrentStrain; + } + + protected override double GetPeakStrain(double offset) + => applyDecay(individualStrain, offset - Previous[0].BaseObject.StartTime, individual_decay_base) + + applyDecay(overallStrain, offset - Previous[0].BaseObject.StartTime, overall_decay_base); + + private double applyDecay(double value, double deltaTime, double decayBase) + => value * Math.Pow(decayBase, deltaTime / 1000); + } +}